Kenzie



' @ateh-tates atntffi.

- CHARLES-1W. .ISBELu or NEW YeuK,.N. Y., AND r. W. MAGKENZIE, er

JERSEY CITY, NEW JERSEY.

' Leim-s PafenfNo. 64,326, afgana-z 30,1867; maand Api-n.22, 1867;.-

IMPEOVEMENT IN STEAM GENEEATOES;

T0 ALL WHOM IT MAYCONCERN: y

Bc it known that We, CHARLES W. [SI:ILI-oi"A Vthe cit-y, county, and State of Non' York, and P. W. MAC- KENZIF., of Jersey City, in the county of Hudsornand vState of New Jerseyhave invented a certain new and v useful Improvement in Steam Boilers, of which the following is a full, clear,and enact description, reference being had to the accompanying drawing, which fer-nis part of this specification, and in which- Figure 1 represcntsa,ve-rtieal'section of a steam vboiler constructed according to our improvement; and

A:Figure 2, a horizontal section of the same taken through the line .r :c in fig. 1.

Like letters refer to like parts in both gures.

Our improvement relates to that class of steam. boilersn'hieh hare their steam generator or main body of it composed of cast-metal sections contiguous to'each other; and ouninventionconsists in a peculiar construc- -tien of said sections, forming a tier or tiers, Aor series, as the case maybe, over or adjoining the fire-boit, and -nrithin a shell enclosing an annular surrounding water space, said sections being foi-ined of rings having radialI tubes or finger-shaped projections running 'in Wal-ds, and openat their outer ends, but closed at their inner ones, andbeing separatelyin communication with the:annulailwateispace surrounding them, while the spaces between themorm fines connecting the smoke-stack with the iirc-box, Whereby'an economical generating surface is obtained, strength insured with' eomparatiye lightness, and a safe latitude given for unequal expansion ;A and your invention further consists, when such a construct-ion of section or lrings is. employed, in formino the radialvv l Y. F2' l tubes, fingers, or pockets, of a gra-dually' dimmlshing or tapering cenguration towards Ytheirinner ande cles'ed ends, whereby a readicr escape is given for the steam generated within them; v l p V For the information of others 'Whom ourl invention concerns, We -u'ill non' proceed to describe it with referenceto the accompanying drawing, in whichl A represents the outer.A case or4 shell of boiler arranged vertically, and which mayfeither be made oi`` wrought orcast iron', leaving an annular Water-space, B, around the interior line andnater-ehambers or steamgen'erating body of the boiler;v also, it may be around the {ire-box C and aslnpit D, and terminating, s'ay, in

a steam dome, E, at top. The fire-box C has no crown-sheet, but instead thereof has mounted` upon itY any number, and which may be two, three, or more ot` cast-iron rings or sections, F, constituting, when piled one upon the other, a tier. These rings are constructed internally te form tire or 'l'ue spaces up through them to the smoke-stack G, and said flucsarc so disposed, bythe .projection within lthe rings of radial and tubular Water.V

chambers in communication with the annular outside space, B,` asl to largely utilize the escaping heatV byits'- action on the Water in the rings, which, combined, form a steam generator.V t' is preferable that these rings.

should bc similar in' construction, se that one pattern Awill sufiicc for all, the tine and waterspaces in each beingY formed by an entire casting. When put together, or mounted one upon the other'iu a tier, they may be packed atthe joints formedby. their junction, and bolted one t'o the other through outside snugs or anges. United, said rings compose-a deep iluc and Water-chamber or steam .generaterbut being in sections, 'there is nothingeof an unwieldy character te make such a chamber objectionablein putting the boiler together. It is not absolutely necessary that the tier of`such rings within the shell should be concentric with the latter, as it may be differ# ently arranged, or tivo, three, or morc'ticrs, side. by side, may be used within the same shell.l The construction of thc rings F is as-folleu's: Projecting radially-into the rings, and cast with them, are inger-shapedtubes or pockets, H, alternately longvand short, though AWhere a less number is used they may be ofequal length or thereabouts, but the space is more fully utilized by constructing them alternately long and short, These tnhcs are open vvat their outer ends, so as to be in direct and separat".` communication 'with the annular W:rter-spece B,v 4but are closed at their inner ends. The spaces, I), between them, form the ilucs that connect the lire-box with the smoke-stack'. lt will be obvious that such an open and radial construction of the steam generator, While strong and light, gives' all requisite latitude for expansion Without risk of breakage. To c'ectually prevent steam as generated lodging in the closed-ends of thc pockets AH, or driving back the Water entering suelrtubes from the annular space B, We make such finger-shaped tubes or pockets of a tapering o1"gradually-diminishing diameter towards their inner c nds, so that steam generated at these points may escape by creeping or Working l along thesides of thcvtubes, gradually enlarging towards their open ends, and especially along the uppervi'ntesigazs 2 rior portion of said tubes. 'A like construction is applicable to horizontal Boilers, the rings or sections in such case being arranged side by side.

What we claim as new and useful herein, and desire to secure. by Letters Patent, s- 1. The steam-generating rings or sections, F, constructed-with radial finger-shaped tubes,"-H, of tapering or diminishing form from their outer und open ends towards their inner and closed extremities, substantially :is`

specified.

2. In eembina-tion wim a series of said rings or sections F, acylindrical shell orcasing'enelosing an annular water-space B, forming n, steam generator', with flue spaces I1 between and nrund the pockets H, esscntiellyiasy herein set forth.

CHAS. W. ISBELL,

I. W. MACKENZIE.

Witnesses:

J. W. Cocinas, G. W. REED. 

